Airsoft Zeel shows two products in 1 package, the WE M4 RIS Gas Blowback Rifle with a Bifrost Smoke Tracer unit mounted. The WE M4 RIS GBB Rifle Black is a gas blowback airsoft rifle that fires in semi-automatic and full-automatic modes. It's designed to look like a modern assault rifle and has a metal RIS handguard for attaching tactical accessories. The SPIT FIRE/SMOKE/BI-FROST/TRACER Silencer Version 2, which is 175mm long, 42mm wide, and has a battery life of 4 hours with low battery notification. It can fire up to 3600 rounds per minute and lasts for approximately 42,000 shots per full charge. Remember to unplug the charger when the indicator turns green and don't leave it unattended while charging. For long-term storage, charge the battery every 2 months to keep it active.